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Fix for BUG#8023.

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Allow LIMIT clause after DUAL.


mysql-test/r/limit.result:
  Added test result for BUG#8023.
mysql-test/t/limit.test:
  Added test for BUG#8023.
sql/sql_yacc.yy:
  Allow the specification of a LIMIT clause after DUAL. This is needed for queries as:
  select a from t1 union all select 1 from dual limit 1;
  In this query LIMIT is applied to the whole UNION, so it makes sense, however, the
  current parser did not allow any clause after DUAL.
This commit is contained in:
unknown
2005-02-02 08:38:24 +02:00
parent 514b2364b4
commit d81a0bede2
3 changed files with 24 additions and 4 deletions
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9
mysql-test/r/limit.result
View File

@ -67,3 +67,12 @@ SELECT * FROM t1;
id id2 id id2
3 0 3 0
DROP TABLE t1; DROP TABLE t1;
create table t1 (a integer);
insert into t1 values (1);
select 1 as a from t1 union all select 1 from dual limit 1;
a
1
(select 1 as a from t1) union all (select 1 from dual) limit 1;
a
1
drop table t1;

10
mysql-test/t/limit.test
View File

@ -49,3 +49,13 @@ SELECT * FROM t1;
DELETE FROM t1 WHERE id2 = 0 ORDER BY id desc LIMIT 1; DELETE FROM t1 WHERE id2 = 0 ORDER BY id desc LIMIT 1;
SELECT * FROM t1; SELECT * FROM t1;
DROP TABLE t1; DROP TABLE t1;
#
# Bug#8023 - limit on UNION with from DUAL, causes syntax error
#
create table t1 (a integer);
insert into t1 values (1);
# both queries must return one row
select 1 as a from t1 union all select 1 from dual limit 1;
(select 1 as a from t1) union all (select 1 from dual) limit 1;
drop table t1;

9
sql/sql_yacc.yy
View File

@ -2455,10 +2455,11 @@ select_into:
select_from: select_from:
FROM join_table_list where_clause group_clause having_clause FROM join_table_list where_clause group_clause having_clause
opt_order_clause opt_limit_clause procedure_clause opt_order_clause opt_limit_clause procedure_clause
| FROM DUAL_SYM /* oracle compatibility: oracle always requires FROM | FROM DUAL_SYM opt_limit_clause
clause, and DUAL is system table without fields. /* oracle compatibility: oracle always requires FROM clause,
Is "SELECT 1 FROM DUAL" any better than and DUAL is system table without fields.
"SELECT 1" ? Hmmm :) */ Is "SELECT 1 FROM DUAL" any better than "SELECT 1" ?
Hmmm :) */
; ;
select_options: select_options: